We help service businesses turn real-world services into simple, useful digital products for end customers.
From meal planning apps for busy families to communication tools for foreign caregivers, we design and build apps that solve your customers' problems and grow your business. We start with discovery — not code — to understand what your customers actually need. Then we guide you from first prototype to a reliable, production-ready app your customers truly use and trust.
Because low-code tools only give you a throwaway version - unless you are a developer yourself. Our packages also include prototypes and MVPs to test ideas and learn quickly, but the final product is a production-ready app that gives you business value from day one — something a free AI prototype simply can’t deliver.
Throwaway prototypes are usually standalone, not integrated with your workflows. Your app will fit seamlessly into your business operations — payment systems, customer databases, notifications, etc.
AI or low-code prototypes often crash, have bugs, or fail under load.
A professional app is tested thoroughly, performs reliably, and can scale with your business.
AI-generated apps often look generic and confusing, which can turn users away. A custom app is designed for your specific audience, creating a smooth, engaging experience.
Free tools or AI may lock you into their platform or require constant rework. A professional app is fully owned by you, maintainable, and ready for future updates.
Free prototypes have no support; if something breaks, you’re on your own. With a professional app, you get ongoing guidance, updates, and troubleshooting.
Your customers trust a polished, reliable app more than a buggy DIY version. A well-built app enhances your brand reputation.
Free tools rarely include data protection, secure authentication, or compliance with privacy regulations. A professionally built app protects your customers’ data and reduces legal risk.
Our packages cover everything you need for a successful app — from the first idea to launch: product discovery, UI/UX design, development & testing, deployment, and project management.
Got an app idea but not yet confident to jump into development? That’s normal — and actually smart. Too many app projects fail, not because of technology, but because no one paused at the start to ask: “Does this idea really solve a problem for my customers?” Don’t risk wasting time or money building features that won’t matter.
Our Product Discovery & MVP Definition Sprints help you answer these key questions and lay the foundation for a successful app:
OUTPUTS:
By the end of Discovery, you’ll have clarity and confidence to move forward.
Duration: 4-6 weeks
Price: 5K USD
For us, apps are more than just technical coding projects. Instead of jumping straight into development, we first figure out what truly matters for your business. To make the most of your resources, we dive deep into your idea and your customers’ problems.
Even after the first app version is launched, we stay by your side to continuously improve the product. That’s why we call ourselves a “Product Lab” rather than a “Project Team” or "Feature Factory": we think beyond technical details, budgets, and deadlines to develop a product that succeeds in the long term.
For you, it means working with a partner who is as invested in your success as you are.
In an initial free conversation — via video call or in person — we get to know each other and your idea, completely without obligation.
Wasting time and money on the wrong features? Not with us. Before we dive into technical development, we explore in detail what your app’s users truly need.
Once we understand user needs and have defined the features, we make sure your app not only looks great, but feels great to use.
With the design in place, we start a proven development process: from technical planning and iterative implementation to quality assurance and testing.
Once all features are developed and tested, it’s time for launch — the moment your vision becomes reality.
Our work doesn’t stop at launch. We stay with you to support long-term growth, improvements, and scaling.
Beyond the core mobile or web app, we implement the supporting systems that make your product scalable, maintainable, and commercially viable — such as:
Yes, absolutely! Janina, founder of Fishtail Product Lab, has been developing complex AI-based language models since her master’s studies in computational linguistics — long before ChatGPT became mainstream.
Get in touch, and together we’ll explore how AI-powered features (like chatbots) can take your app business to the next level.Sprich uns an, und gemeinsam finden wir heraus, wie KI-basierte Features (wie zum Beispiel Chatbots) dein App-Business auf das nächste Level heben können.
Where your app’s data lives is entirely up to you — in the U.S., EU, or any cloud provider you choose. The location of our development team does not affect where your customer data is stored and processed.
We follow best practices for technical and organizational security, and can coordinate security audits or penetration tests if needed.
Your contract is with a professional, insured development partner, giving you peace of mind that your project is handled responsibly and reliably.
We are an international collective of entrepreneurs, product managers, and tech talent.
Together, we’ve delivered over 20 mobile and web apps for clients across Europe, North America, and Asia. For your app idea, we assemble a dedicated design and development team from our talent pool, led by experienced product managers to ensure your project succeeds.
Hi! 🙌 I’m Janina. I founded Fishtail Product Lab three years ago. I bring expertise in linguistics, business, and computational technology and have spent the last five years co-developing AI applications and launching new tech products.
I’m especially proud of our flagship product, sanu — an investor-backed app designed to bridge the caregiving gap in Europe. Today, at Fishtail Product Lab, I help bring new apps from scratch to market for our clients.
My mission is simple: to collaborate with visionary minds and develop outstanding apps from zero to launch 🌟
We focus on modern, scalable, and secure technologies to build mobile and web apps that drive your business forward.
I’ll get back to you.
Talk soon,
Janina, founder of Fishtail Product Lab
In the meantime, feel free to explore our blog 👇